JP2001307335A - Card-type optical information recording medium and truth/falsehood discriminating method of card-type optical information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a card-type optical information recording medium which remarkably reduced the recording-loss area generated in the border part between the reproduction exclusive area and the additionally recordable area in a hybrid CD-R disk. SOLUTION: This recording medium is a card-shaped disk A based on a TAO system of the CD-R and provided with the information recording area R having only one session 4 so as to surround a disk clamp hole 1. Read-in area 5, reproduction exclusive information area 3, additional/record information area 6 and read-out area 7 are arranged on the session 4. The 1st track is recorded in the reproduction exclusive information area 3 and the 2nd track is recorded in the additional record information area 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a card-type optical information recording medium having both a read-only area and a recordable area, and a method for determining the authenticity of the card-type optical information recording medium.

[0002]

2. Description of the Related Art A recordable compact disc (hereinafter referred to as "C")
Some standards use "multi-session" in which a disc is divided into a plurality of sessions for use. Here, the session is a name of a recording unit in which three areas of a lead-in area, a program area, and a lead-out area are set as one set. A "hybrid" standard is known in which a first session of such a multi-session is set as a reproduction-only area and a second session is set as an additional recordable area where additional recording is possible (FIG. 6).

As shown in FIG. 6, the information area format of the "hybrid type" CD-R extends from the inner circumference to the outer circumference of the disc (from the left end to the right end in FIG. 6) and a PCA (Power Calibration).
Area), PMA (Program Memory)
Area), the first session (1 ^st Session),
The second session (2 ^nd Session) is a structure which is sequentially formed. PCA is a test area (Test Area).
a) and a count area (Count Area). The first and second sessions include a lead-in area (L / i Area) and a program area (Pr), respectively.
program Area), lead-out area (L / o)
Area).

In order to specifically realize the "hybrid type" standard shown in FIG. 6, a part of the PMA and the first session are each a read-only area, and are each a normal compact disc (hereinafter referred to as "CD"). ) Record in the same way as the recording. Further, the PCA, the remaining area other than the read-only area of the PMA, and the second session are additionally recordable areas, and are ATIP (Absolute Time).
A continuous groove track having an (In Pre-groove) signal is recorded. These records are made in a mastering process at a factory, and a master for molding is prepared. Next, based on this master, a disk substrate is formed from a transparent substrate material made of polycarbonate, an organic dye film is applied over the entire recording surface of the disk, and a reflective film such as gold or silver and a protective coat film are formed. To complete the hybrid type CD-R disc.

[0005] The read-only area of this disk is composed of spiral recording tracks, and in order to record information signals there is a method of recording pits and lands on the track in length (hereinafter referred to as "pit recording"). Adopted. The additional recordable area of this disk is composed of spiral continuous groove tracks. To record information signals, an organic dye applied on the continuous groove tracks is used to thermally record information with the laser of a recorder. (Hereinafter, referred to as “continuous groove recording”). The pit depth of the read-only area of the disk, the continuous groove depth of the additionally recordable area, and the thickness of the organic dye have a predetermined relationship, for example, as in the invention described in Japanese Patent No. 2,580,820. It is disclosed that recording and reproduction are possible when both signal levels are within the “hybrid type” standard.

[0006]

The boundary between each session in the above-mentioned multi-session is in contact with the end of the lead-out area of the preceding session and the start of the lead-in area of the subsequent session. In the “hybrid type” standard, there is a restriction particularly on the boundary between the first session and the second session.
Second, the lead-in area of the second session is set to 60 seconds. A total of 150 seconds of this connection portion is a recording loss area that cannot be used by the user.

[0007] The amount of data for 150 seconds on a CD-R is approximately 2 when converted to user data on a CD-ROM.
3 MB. This recording loss amount is about 1.5% in the case of a standard CD-ROM (recording capacity of 650 MB) having a diameter of 120 mm, and is a negligible value. However, a compact CD-ROM with a diameter of 80 mm (total capacity of 185 MB) has a 12% capacity and a cash card shape (recording capacity 31
In the case of MB), this is 74%, which is an unacceptable loss in use.

Accordingly, the present invention has been made to solve this problem. In particular, the present invention forms a read-only area and an additional recording area (additional recordable area) in only one session. The dedicated area has a read-only information area,
The additional recording area has a lead-in area, an additional recording information area, and a lead-out area, and a read-only information area and an additional recording information area in a program area are formed as continuous tracks. Or, packet writing (PacketWriti)
ng) By recording and reproducing information according to the method,
Provided are a card-type optical information recording medium and a method for determining the authenticity of a card-type optical information recording medium, in which the amount of recording loss that cannot be used by a user at the boundary between two sessions in the aforementioned “hybrid” standard is significantly reduced. With the goal.

[0009]

In order to solve the above-mentioned problems, the present invention provides a card-type optical information recording medium having the following constitutions (1) to (4), and authenticity discrimination of the card-type optical information recording medium. Provide a way. (1) A card-type optical information recording medium that records and reproduces information in a recording method in which each area of a PCA, a PMA, and a first session is sequentially formed from inside to outside according to the TAO method of a CD-R disc. A recording unit that enables writing and reading of information by a light beam emitted from a light beam irradiation unit used for recording and reproduction of the CD-R disc, and has a read-only area and an additional recording area. And
The recording unit is configured as the first session including a lead-in area, a program area, and a lead-out area. The program area includes a read-only information area including tracks 1 to n-1 (n is an integer). And a track n to a track m (m is an integer, m> n), and is formatted by the TAO method. (2) Card-type optical information recording for recording / reproducing information by a recording method in which each area of PCA, PMA and the first session is sequentially formed from inside to outside according to the packet writing method of a CD-R disc. A recording medium that enables writing and reading of information by a light beam emitted from a light beam irradiation unit used for recording and reproduction of the CD-R disc, and has a read-only area and an additional recording area. Wherein the recording unit is configured as the first session including a lead-in area, a program area, and a lead-out area, and the program area includes a read-only area including tracks 1 to n-1 (n is an integer). The information area and tracks n to m (m is an integer and m
> N), and each of the tracks n to m is composed of a plurality of divided packets, and each of the packets is formatted by the packet writing method. A card-type optical information recording medium characterized in that: (3) The card-type optical information recording medium according to (1) or (2), wherein a part of the PCA, a part of the PMA, and the read-only information area are each a pit recording area, and A card-type optical information recording medium, wherein the recording area is a groove recording area. (4) A discriminating method for authenticating a card-type optical information recording medium according to claim 3, wherein each of the pit recording areas of the PCA, the PMA, and the read-only information area of the card-type optical information recording medium to be inspected. Among the groove recording areas of the PCA, the PMA, and the additional recording information area, the reflectance in at least one recording area is detected, and the reflectance in the detected recording area becomes the reflectance in the regular recording area. If the same is true, the card-type optical information recording medium to be inspected is determined to be true. If the reflectance in the detected recording area is not the same as the reflectance in the regular recording area, the optical information recording medium to be inspected is determined. A method for determining the authenticity of a card-type optical information recording medium, comprising determining the medium as false.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 3 and 4 described below, the present invention conforms to the TAO system for CD-R discs, and includes a PCA, a PMA, and a first session from inside to outside. Card type optical information recording medium (card type disc) A for recording and reproducing information by a recording method in which areas are sequentially formed
Wherein information can be written and read by a light beam irradiated from a light beam irradiation means used for recording and reproduction of the CD-R disc, and a read-only area (PCA).
2a, a partial area of the PMA 2b, a read-only information area 3 in the program area in the first session 4) and an additional recording area (an area other than the part of the PCA 2a, and an area other than the part of the PMA 2b) Other areas, the lead-in area 5 and the lead-out area 7 in the first session 4,
A recording section (information recording area) R provided with an additional recording information area 6) in a program area in one session 4. The recording section R includes a lead-in area 5, a program area, a lead-out area 7, And the program area includes a read-only information area 3 including tracks 1 to n-1 (n is an integer) and a track n to track m (m is an integer and m>
n) and the additional recording information area 6 and the TA
This is a card type optical information recording medium characterized by being formatted in an O system. Also, the present invention provides a card type recording / reproducing information by a recording method in which each area of PCA, PMA and the first session is sequentially formed from inside to outside according to a packet writing method of a CD-R disc. In the optical information recording medium, each of the tracks n to m is composed of a plurality of divided packets, and each of the packets is formatted by the packet writing method. This is a card-type optical information recording medium. Further, the present invention provides the card-type optical information recording medium described above, wherein a part of the PCA 2a, a part of the PMA 2b, and the read-only information area 3 are each a pit recording area, and the additional recording area ( The other area of the PCA 2a other than the part, the other area of the PMA 2b other than the part, the lead-in area 5, the lead-out area 7, and the additional recording information area 6) are defined as groove recording areas. A card-type optical information recording medium characterized by the following. Still further, the present invention is a discriminating method for discriminating the authenticity of the card-type optical information recording medium, wherein the PCA, the PMA and the pit recording of the read-only information area of the card-type optical information recording medium to be inspected. The reflectance in at least one recording area R is detected among the area and the groove recording areas of the PCA, the PMA, and the additional recording information area, and the reflectance in the detected recording area R is a regular recording area. When the reflectance is the same as the reflectance in R, it is determined that the card type optical information recording medium to be inspected is true, and the reflectance in the detected recording area R is
If the reflectance in the regular recording area R is not the same, the authenticity of the card-type optical information recording medium is determined to be authentic.

Further, according to the present invention, as shown in FIGS. 3 and 4 described later, the PCA (PoW
er Calibration Area) 2a, PM
A (Program Memory Area) 2b,
Card-type optical information for recording / reproducing information in accordance with a TAO (Track At Once) method of a CD-R (recordable compact disc), which is a recording method in which each area of the first session (Session) is sequentially formed. A recording medium (card-type disc) A having a through hole (disc clamp hole) 1 having the same size as the center hole of the optical disc;
And information writing / reading by a light beam emitted from a light beam irradiating means used for recording / reproducing of the optical disk, and a track formed in a spiral shape is provided, and a session (4) is provided in a lead-in area ( 5), a program area, a lead-out area (7), and a program area, wherein the program area is the first session (1 ^st ) in the TAO system including a read-only information area (3) and an additional recording information area (6). Session), the read-only information area (3) of the read-only area is composed of track 1, the additional recording information area (6) of the additional recording area is composed of track 2, and the PC
In A, information on the optimum irradiation power of the light beam irradiated to the additional recording area (6) and, if necessary, dummy data in the read-only area (3) are recorded. ), Information relating to the read-in area (3) and the lead-in (5) of the additional recording information area (6) is temporarily recorded until the recording in the card-type optical information recording medium is completed. is there. Still further, the present invention relates to a card-type optical information recording medium for recording and reproducing information in accordance with the format of an optical disk, wherein information is recorded by a light beam emitted from a light beam irradiating means used for recording and reproducing the optical disk. A recording section provided with a read-only area and a write-only area and an additional recording area in which recording can be performed only once;
A part of the MA and a read-only information area of a program area are provided, and the additional recording area includes the remaining area of the PCA and PMA, a lead-in area, a lead-out area in a session, and an additional recording information area of a program area. A card-type optical information recording medium having a structure in which a read-only information area and an additional recording information area of a program area are formed as continuous tracks. Furthermore, the present invention provides
PCA (Power Calib) from inside to outside
ratio Area), PMA (Program
Memory Area), Session 1 (Sess)
C), which is a recording method in which each area of C.Ion) is sequentially formed.
TA of DR disc (recordable compact disc)
A card-type optical information recording medium for recording and reproducing information in accordance with the O system, wherein information can be written and read by a light beam emitted from a light beam irradiating means used for recording and reproduction of the optical disk, and the information can be reproduced. A recording unit provided with a dedicated area and an additional recording area in which recording can be performed only once, wherein the recording unit is a TAO system including a PCA, a PMA, a lead-in area, a program area, and a lead-out area. The read-only area is configured as a first session, and the read-only area includes PCA and PMA related to tracks 1 to n-1 and read-only information including tracks 1 to n-1 (n is an integer) of the program area. And an additional recording area, wherein the additional recording area is a PCA related to tracks n to m (n is an integer and m> n).
PMA, a lead-in area, an additional recording information area which is a track n to a track m of the program area, and the lead-out area, and the PCA is provided with a light irradiated to the additional recording area (6). Information on the optimum irradiation power of the beam and, if necessary, dummy data in the read-only area (3) are recorded. The PMA stores the read-only area (3) until the recording in the session (4) is completed. And lead-in (5) of the additional recording information area (6)
Is a card-type optical information recording medium, characterized in that information about the card is temporarily recorded.

Hereinafter, the present invention will be described specifically.
FIG. 1 is a diagram for explaining a recording format of a TAO system CD-R disc, FIG. 2 is a diagram for explaining a recording format on each track of a TAO system, and FIG. 3 is a card-type optical information recording medium of the present invention. FIG. 4 is a diagram for explaining a recording format used in one embodiment of the present invention, FIG. 4 is a plan view for explaining one embodiment of a card-type optical information recording medium of the present invention, and FIG. TA on recording media
FIG. 3 is a diagram for explaining a cross-sectional structure of a recording medium when an O-format recording format is applied.

CD-R discs are roughly classified into the following two recording systems. One recording method is “DAO” that can only be recorded once and cannot be additionally recorded on a disc.
(Disc At Once) method. This method (format) has the same format as a music CD, CD-ROM, or the like molded based on a master disc at a factory, and has no link point generated at the time of additional recording.

[0014] The other recording method includes a "write-once type (Incremental Wr-
Iting) method. This "write-once" method has 3
There are several types, "SAO (Session At Onc)
e)) method, “TAO (Track At Onc)
e)) method, “Packet Writing (Packet
Writing). In any of these three types of "write-once" type, when the write-once is performed after the first time, the head of the additionally-recorded information has a link point, and the continuity is set so as not to be disconnected from the data of the previous or previous recording area. To secure.

The "SAO" system allows additional recording on a session basis. In the “TAO” method, one session is divided into a plurality of tracks, and additional recording can be performed in track units. In addition, the “packet writing” method further tracks tracks in a session.
It can be divided into packet units and can be additionally recorded.

[0016] Additional recording of the "TAO" system is first performed in the first
The predetermined information is recorded on the track, and thereafter, the information such as the start and end times of the first track is written in the PMA, thereby completing the operation. Next, information recording is performed in the same manner as the information recorded on the first track in the order of the second track and the third track. When writing a predetermined number of tracks and ending the additional recording of the session, the information is recorded on the last track and information such as the start and end times of the last track is written on the PMA, and then written on the PMA. The recorded information such as the start time of each track is transcribed and recorded in the lead-in area (L / i), and the lead-out area (L / o) starting from the end time of the last track is additionally recorded. Ends.

In this "TAO" system, additional recording can be performed in a track unit a plurality of times.
A link point is required at the beginning of the track. Also,
When writing predetermined information into the lead-in area and the lead-out area, a link point is required at the head of each.

The "packet writing" system is a system in which each track of the above-mentioned "TAO" system can be divided into smaller tracks and additionally recorded. Packets for each area to be divided
(Packet), and the boundary between packets is a link point.

Next, regarding a loss recording area which exists between two user data areas and cannot be used by the user, which occurs when user data is recorded by two additional recordings, "T
The “AO” method and the “SAO” method will be compared.

In the "TAO" system, user data is recorded in track units. The recording format of each track is
The format shown in FIG. 2A is continuous with the format shown in FIG. Each format shown in FIGS. 2A and 2B has a packet structure. The user data area in the preceding format shown in FIG. 2A is "Track Description".
It is called "r Blocks" and records a track ID, a track number, a packet length, and the like. The user data to be recorded on the track is a user data block “User Data” in the format shown in FIG.
Blocks ".

The link block (Link Block) in the format shown in FIG. 2 (a) to the run-out block 2 (Run-out Block 2), and the link block (Link) in the format shown in FIG. From Block to Run-in Block 4 is called a pre-gap 150 block (2 seconds), and is an essential area in the “TAO” system.

As a result, the "TAO" shown in FIGS.
In one embodiment of the present invention, the number of tracks is 2 (T
track 1, 2), the number of blocks required other than the user data block for recording the user data to be recorded on the track is the pre-gap 1
In addition to the 50 blocks (2 seconds), two run-out blocks 1 and 2 (Run-out Block) following the user data block in the format shown in FIG.
1, 2) are required, and when these two blocks are added to the pre-gap 150 blocks (2 seconds) described above, a total of 15 blocks is obtained.
There are two blocks. Here, since the number of tracks is 2,
In the session, about 623 kB (152 blocks x 2
048B × 2 tracks), which is a loss recording area.

On the other hand, "SAO" composed of two sessions
Even in the system, the pre-gap 150 blocks described above are required at the beginning of each first track of the first and second sessions. Furthermore, since recording is performed in session units, the above-described lead-out area of 90 seconds and the lead-in area of 60 seconds are required at the boundary between the first session and the second session. As a result, the loss recording area has a total of 154 seconds of 23 seconds. .6 MB.

As a result, when the user data is recorded in two areas, if the user data is recorded in the “TAO” system, the “SAO”
Compared with the method, the loss recording area can be greatly reduced.

Here, the reproduced signals of the first session of the “SAO” system and the “hybrid type” are compared. It is common that both are multi-sessions. The difference between the two is that the “SAO” method is a reproduction signal by continuous groove recording, and the “hybrid type” is a reproduction signal by pit recording. That is, in both the “SAO” method and the “hybrid type”, the reproduced signals in the lead-in area, the program area, and the lead-out area in the first session are the same, and there is a problem in recording and reproducing in the second step in the next step. It turns out there is no.

Thus, in the conventional "hybrid type", the first session is formed by pit recording, the second session is formed by continuous groove recording, and a lead-out area and a lead-in area are inserted between each session. "TA" for the entire disc, pit recording for the first track, and continuous groove recording for the second and subsequent tracks.
By changing to the new method of recording using the "O" method, it is possible to obtain a disc in which the loss recording area is greatly reduced.

That is, if the conventional “hybrid type” recording loss amount of 23.6 MB is changed to the “TAO” system, the recording loss amount becomes 623 MB.
The amount of loss can be kB, and the difference is about 1/38. As a result, the cash card shape (recording capacity 31
Also in the case of MB), the loss recording amount due to the link is about 2%, which is a negligible loss amount. As described above, a cache card-shaped recording medium with a negligible loss recording amount can be realized if recording can be performed not by the multi-session type “hybrid type” but by the write-once type “TAO” type.

Next, from the viewpoint of a recording / reproducing apparatus for recording / reproducing data in such a “TAO” system, if the reproduction signal of the disk recording signal is the same, whether it is pit recording or continuous groove recording, It means that the recorded physical shape does not matter. That is, CD standard, CD-R
As long as the standard is satisfied, the disc recording information may be either pit recording or continuous groove recording.

The present invention focuses on this point, and in order to enlarge a user recording area of a cash card size whose recording capacity is limited, a “TAO” system capable of additionally recording can be used.
This is to realize the format of the "cket writing" system by the pit recording system.

In the above-mentioned "hybrid type" (FIG. 6), the disc is composed of first and second sessions. The first session records pits and the second session records continuous grooves.
PCA and PMA are arranged before the lead-in area of the first session. PCA is an area for determining the optimum laser power in continuous groove recording, and is divided into a test area and a count area.

In the sequence for obtaining the optimum laser power using the PCA, first, the laser power of the recorder is changed stepwise and recording is performed on the test area. The optimum value of the recording signal is determined from the reproduced signal, and the optimum value is recorded in the count area. This optimum value is the optimum recording power for performing continuous groove recording on the disc by the recorder.

The PMA is a temporary lead-in area until the recording in the session is completed. On a CD,
The start time and the like of each track in the program area are recorded in the lead-in, and the playback device searches the disk based on the information. In the case of the “TAO” system, this lead-in information cannot be obtained unless all tracks to be recorded in the session are completed. Therefore, every time the writing of each track is completed, the information of each track is written to the PMA, and the writing in the session is performed. Is completed, the PMA data is transferred to lead-in.

The "hybrid type" PMA needs to record the lead-in information of the first session by pit recording. In FIG. 6, the dark color indicates a pit recording portion, and the other portion (white) indicates a continuous groove recording portion.
The pit recording and the continuous groove track are recorded in a disk master manufacturing process.

Further, both the pit recording track and the continuous groove recording track are wobbled by an FM signal modulated by an ATIP signal. In the ATIP, recording characteristic information and address information relating to a disc corresponding to a subcode of a CD are recorded. At the time of recording, continuous groove recording is performed at a predetermined address based on the ATIP information.

The recording format of the "TAO" method CD-R shown in FIG. 1, tracks constitute a disk recording region in the first session (1 ^st Session), further a plurality of n through the session (n is an integer) (Track1
~ Track n). The entire recording area (PCA, PMA, first session) shown in FIG. 1 is a continuous groove recording method having the ATIP signal. Further, n additional recordings corresponding to n tracks can be performed.

In the recording of the first track (Track 1), the laser power is determined by the PCA, and a predetermined signal is recorded in the track area. Then, the start time of the track and the like are recorded in the PMA. In the additional recording of the second track (Track 2) after the recording of the first track, the head of the second track is superimposed on the tail of the first track at the link point, and the same recording is performed on the PMA. Further, the same recording method is used for the third and subsequent tracks (Track 3 to Track n). When the recording of all n tracks is completed, the information recorded in the PMA is re-recorded in the lead-in area, and then recorded in the lead-out area, and the session is completed.

FIGS. 2A and 2B show a format for recording user data on a track basis in the "TAO" system. Each track records the packet structure shown in FIGS. 2A and 2B in a continuous format. The preceding user data area in FIG. 2A is a Track Desc.
This is called the "ripor blocks" and is the track I
D, a track number, a packet length, and the like are recorded. The user data of each track is the User Data of FIG.
a Blocks.

The link block (L) shown in FIG.
Ink Block) to Run Out Block 2 (Ru
n-out Block) and the subsequent link block (Link Block) to the run-in block 4 (Run-in Block 4) in FIG. 2B are called a pre-gap 150 block (2 seconds), and are referred to as a “TAO” system. Is mandatory. When a subsequent track is additionally recorded on the preceding track, a run-out block 2 (Run-out Block 2) of the last block of the preceding track is used.
And the link block (L
Ink Block) is a link point, and both blocks are recorded so as to overlap in a predetermined relationship.

FIG. 3 shows an embodiment of the recording format of the present invention. 1 having the same structure as the recording format shown in FIG.
“TA” that divides the session (1 ^st Session) into two tracks (Track 1 and Track 2)
O "method. In this embodiment, the recording related to the first track (Track 1) is performed by pit recording,
On the second track (Track 2), continuous groove recording, which is normal CD-R recording, is performed. In FIG. 3, the dark color is the pit recording portion,
Other portions (white) indicate continuous groove recording portions. The pit recording and the continuous groove track are recorded in a disk master manufacturing process. The reproduction signal related to the first track in FIG. 3 has the same format as that of the relevant reproduction signal after recording the first track in FIG. 1 and has an area related to the first track so that a predetermined RF signal is generated. Perform pit recording.

For this reason, in the mastering process of manufacturing the master, the information recording area is pre-wobbled and modulated by the ATIP signal, the first track is recorded with user data by a predetermined pit recording method, and the second track is formed by a continuous groove track. I do. The second track is a continuous groove additional recordable area, which is the same as a normal CD-R. At this time, in the recording related to the first track, the pit recording of the first track is completed so that the second track in the same session can be additionally recorded by the “TAO” method. Thus, when the second track is additionally recorded, the structure of the single session is maintained.

FIG. 4 shows the shape of a card type disk according to an embodiment of the present invention. In this embodiment, the outer shape is a card type disk, and the inner side is configured as a disk (CD-R) having the recording format of the “TAO” system described in FIG. The card type disc A has an information recording area R surrounding the outer periphery of the central clamp hole 1.

At the center of the card type disk A, there is provided a disk clamp hole 1 used for clamping the card type disk A on the recording / reproducing apparatus side. Outside the disc clamp hole 1 is an information recording area R having a spiral recording track.
a, PMA 2 b, and session 4. The session 4 includes a lead-in area 5 and a read-only area 3 from the inside.
And a write-once recording information area 6 and a lead-out area 7.

FIG. 5 shows an embodiment of the present invention, "TAO".
FIG. 1 is a cross-sectional view of a configuration of a card-type disc of a system. The left end in FIG. 5 is the disk clamp hole 1 side (inner peripheral side), and the right end is the outer peripheral side of the disk. The card type disc A is formed by sequentially laminating a recording dye layer 11, a reflective film layer 12, and a coating layer 13 on a substrate 10 having an irradiation surface 10a to be irradiated with a laser. L indicates the incident direction of the laser.

The substrate 10 is made of a polycarbonate substrate, and its recording track has the same track pitch c as that of a CD, that is, 1.6 μm. The recording track is composed of two types, a pit recording area p by pit recording and a groove recording area g by continuous groove recording. The track cross section of the pit recording area p has an inverted trapezoidal well shape, while the track cross section of the groove recording area g has an inverted triangular V-groove shape. The pit recording area p and the groove recording area g are provided with the recording dye layer 11 by a method of applying a spin coating method. As a result, as shown in FIG.
It becomes a structure covered with. The surface of the recording dye layer 11 is provided with a reflective film of gold, silver or the like, and becomes the reflective film layer 12. A coating layer 13 is provided on the reflective film layer 12 to protect the reflective film.

The well-shaped track cross-sectional shape of the pit recording area p and the V-groove track cross-sectional shape of the groove recording area g, which constitute the groove cross-sectional shape of the polycarbonate substrate 10, are the cross-sectional shape of the recording dye layer 11 and the reflection film. The combination of the concavo-convex shapes of the layer 12 is determined so that each reproduced signal is optimized.

As described above, there is a difference in brightness between the pit recording area p and the groove recording area g that can be clearly recognized even in daily life light due to the difference in the track cross-sectional structure. The reason is that pits are generated sharply by the cutting machine in the pit recording area p, so that the direction of scattering of incident light is generated, and the entire area appears dark with ordinary light. As a result, the first track is previously manufactured by pit recording and the second track is previously manufactured by the pit recording, as in the case of a disk in which the whole disk is manufactured by continuous groove recording like a CD-R disk and the card type disk A of the present invention.
In a disc on which tracks are additionally recorded by a CD-R recorder, the difference in reflected light due to the above reasons can be clearly discriminated visually.

It was confirmed by experiments that the normal CD-R
Change in reflectance before and after recording on the disc is 63% to 50%
Reduced to The reflectivity of the pit recording area p of the present application is 44%.
Met. On the other hand, the change in the reflectance of the groove recording area g of the present invention changed from 73% to 51%. As a result, it was found that the pit recording area p and the groove recording area g could be easily visually distinguished before and after recording.

As described above, in the “hybrid type” multi-session, a disk capacity of 23 MB corresponding to the lead-out and lead-in areas required between sessions can be used as user data.
In the embodiment, the number of tracks in the “TAO” system has been described as two.
It goes without saying that a similar effect can be obtained by the "writing" method.

Further, in an information recording medium having a small information recording surface area such as a disk having a small diameter or a card type, the loss of the data amount due to the hybridization can be eliminated, and the application range of the write-once optical disc can be expanded. There is. Furthermore, since the pit recording area of the disk is written in advance in the mastering process at the factory, the number of recording steps can be reduced, the pit recording area cannot be falsified later, and the difference in physical structure between the pit recording area and the groove recording area of the disk. Thus, the regions having different reflectivities are obtained, and there are effects such as easy authentication.

[0050]

As described above, according to the present invention, in particular, a read-only area and an additional recording area are formed in only one session, and a read-only information area is provided in the read-only area. The additional recording area is provided with a lead-in area, an additional recording information area, and a lead-out area, and information is recorded in accordance with the TAO system having a structure in which the read-only information area and the additional recording information area in the program area are formed as continuous tracks. By reproducing, it is possible to provide a card-type optical information recording medium in which the recording loss that cannot be used by the user at the boundary between two sessions in the “hybrid type” standard is significantly reduced.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a recording format configuration of a TAO type CD-R disc.

FIG. 2 is a diagram for explaining a recording format in each track of the TAO system.

FIG. 3 is a diagram for explaining a recording format used in an embodiment of the card-type optical information recording medium of the present invention.

FIG. 4 is a plan view illustrating an embodiment of a card-type optical information recording medium according to the present invention.

FIG. 5 is a diagram for explaining a cross-sectional structure of a recording medium when a TAO recording format is applied to the card-type optical information recording medium of the present invention.

FIG. 6 is a diagram illustrating a recording format of a hybrid type CD-R.

[Explanation of symbols]

 Reference Signs List 1 Disc clamp hole (through hole) 2a PCA 2b PMA 3 Read-only information area 4 Session 5 Lead-in area 6 Additional recording information area 7 Lead-out area 10 Substrate 10a Laser incident surface 11 Recording dye layer 12 Reflective film layer 13 Coating layer A Card type disc (card type optical information recording medium) c Track pitch g Groove recording area p Pit recording area R Information recording area (recording section)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 7/30 G11B 7/30 A 20/12 20/12

Claims (4)

[Claims] 1. A card-type optical information recording / reproducing information by a recording method in which respective areas of a PCA, a PMA, and a first session are sequentially formed from inside to outside according to the TAO method of a CD-R disc. A recording medium, comprising: a recording section which enables writing and reading of information by a light beam emitted from a light beam irradiation means used for recording and reproduction of the CD-R disc, and has a read-only area and an additional recording area The first session includes a lead-in area, a program area, and a lead-out area, and the program area includes tracks 1 to n-1
(N is an integer) consisting of a read-only information area and a track n
And a track m (m is an integer, m> n), and is formatted by the TAO method. 2. In accordance with a packet writing method for a CD-R disc, PCA, PM
A: A card-type optical information recording medium for recording and reproducing information by a recording method in which each area of a first session is sequentially formed, and is irradiated from a light beam irradiation unit used for recording and reproducing of the CD-R disc. A recording unit that enables writing and reading of information by a light beam and has a read-only area and an additional recording area, wherein the recording unit includes a first area including a lead-in area, a program area, and a lead-out area; The program area is composed of tracks 1 to n-1.
(N is an integer) consisting of a read-only information area and a track n
And track m (m is an integer, m> n). Each of the tracks n to m is composed of a plurality of divided packets. Is a card-type optical information recording medium, which is formatted by the packet writing method. 3. The card-type optical information recording medium according to claim 1, wherein a part of the PCA, a part of the PMA, and the read-only information area are each a pit recording area, A card-type optical information recording medium, wherein the additional recording area is a groove recording area. 4. A discriminating method for discriminating the authenticity of a card-type optical information recording medium according to claim 3, wherein the PCA and the PM of the card-type optical information recording medium to be inspected.
A: detecting the reflectance in at least one of the pit recording areas of the read-only information area and at least one of the groove recording areas of the PCA, the PMA, and the additional recording information area; Is the same as the reflectance in the regular recording area, the test card type optical information recording medium is determined to be true, and the reflectance in the detected recording area is equal to the reflectance in the regular recording area. A method for determining the authenticity of a card-type optical information recording medium, comprising determining that the card-type optical information recording medium to be inspected is fake when they are not the same.